Vibration actuator with movable body and fixing body having magnetic cylindrical body outside coil with length

A vibration actuator comprising:

• a movable body which comprises a stack formed by a magnet, a pair of magnetic cores and a pair of non-magnetic weights, is supported at both upper and lower sides of the movable body by a pair of leaf springs made of a magnetic material connected respectively to the pair of non-magnetic weights, and is operable to move vertically inside of a coil of a fixing body, wherein
• the fixing body further comprises a magnetic cylindrical body which is disposed outside of the coil, and has a length, the length being longer than a distance between upper and lower ends of the pair of magnetic cores and shorter than a distance between the ends on the magnetic core side of the pair of leaf springs,
• each of leaf springs comprises:
• an inner periphery part having a smaller diameter;
• an outer periphery part having a larger diameter;
• and a deformation arm being elastically deformable and having an inner end connected to the inner periphery part and an outer end connected to the outer periphery part, and
• the outer periphery part is joined to the fixing body and the inner periphery part is joined to the movable body.